Ability to download tracks

- Adding the option to download the selected track or tracks.
When the download is clicked it opens a dialog that lets you choose where
you want to save the track and the file name (by default
the file name is the track number, the track name and the extension, example "03 - my song.mp3")
If there are many tracks selected it will open one dialog for each track
- Next steps: download an album and a playlist using zip

backend/mediaprovider/mediaprovider.go

@@ -1,6 +1,9 @@
 package mediaprovider
 
-import "image"
+import (
+	"image"
+	"io"
+)
 
 type AlbumFilter struct {
 	MinYear int
@@ -83,4 +86,6 @@ type MediaProvider interface {
 	DeletePlaylist(id string) error
 
 	Scrobble(trackID string, submission bool) error
+
+	DownloadTrack(trackID string) (io.Reader, error)
 }

backend/mediaprovider/subsonic/subsonicmediaprovider.go

@@ -3,6 +3,7 @@ package subsonic
 import (
 	"errors"
 	"image"
+	"io"
 	"math"
 	"strconv"
 	"sync"
@@ -249,6 +250,10 @@ func (s *subsonicMediaProvider) SetRating(params mediaprovider.RatingFavoritePar
 	return err
 }
 
+func (s *subsonicMediaProvider) DownloadTrack(trackID string) (io.Reader, error) {
+	return s.client.Download(trackID)
+}
+
 func toTrack(ch *subsonic.Child) *mediaprovider.Track {
 	if ch == nil {
 		return nil

go.mod

@@ -7,7 +7,7 @@ require (
 	fyne.io/x/fyne v0.0.0-20230611151101-afdcd6b92cf3
 	github.com/20after4/configdir v0.1.1
 	github.com/dweymouth/go-mpv v0.0.0-20230406003141-7f1858e503ee
-	github.com/dweymouth/go-subsonic v0.0.0-20230513020020-0790f53c2868
+	github.com/dweymouth/go-subsonic v0.0.0-20230614154319-792d18c75fb4
 	github.com/google/uuid v1.3.0
 	github.com/pelletier/go-toml v1.9.3
 	github.com/zalando/go-keyring v0.2.1

go.sum

@@ -80,6 +80,8 @@ github.com/dweymouth/go-mpv v0.0.0-20230406003141-7f1858e503ee h1:ZGyJ6wp7CAfT31
 github.com/dweymouth/go-mpv v0.0.0-20230406003141-7f1858e503ee/go.mod h1:Ov0ieN90M7i+0k3OxhA/g1dozGs+UcPHDsMKqPgRDk0=
 github.com/dweymouth/go-subsonic v0.0.0-20230513020020-0790f53c2868 h1:403Dden/cdQyDM8ydonHLxTBPjgQXZ76PUfmBG92+Dw=
 github.com/dweymouth/go-subsonic v0.0.0-20230513020020-0790f53c2868/go.mod h1:fUez6NFiEJiQTZizZ1BThZr5GJXAbigzGYjEPNm4tdI=
+github.com/dweymouth/go-subsonic v0.0.0-20230614154319-792d18c75fb4 h1:cuyvB4GjTMBHKJwMJ/LFpuKfSVXuCheNj6fgxBa3m1Y=
+github.com/dweymouth/go-subsonic v0.0.0-20230614154319-792d18c75fb4/go.mod h1:fUez6NFiEJiQTZizZ1BThZr5GJXAbigzGYjEPNm4tdI=
 github.com/eclipse/paho.mqtt.golang v1.3.5/go.mod h1:eTzb4gxwwyWpqBUHGQZ4ABAV7+Jgm1PklsYT/eo8Hcc=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=

ui/controller/controller.go

@@ -3,7 +3,10 @@ package controller
 import (
 	"fmt"
 	"image"
+	"io"
 	"log"
+	"os"
+	"strings"
 	"time"
 
 	"github.com/dweymouth/supersonic/backend"
@@ -113,6 +116,7 @@ func (m *Controller) ConnectTracklistActions(tracklist *widgets.Tracklist) {
 	tracklist.OnColumnVisibilityMenuShown = func(pop *widget.PopUp) {
 		m.ClosePopUpOnEscape(pop)
 	}
+	tracklist.OnShowDownloadDialog = m.ShowDownloadDialog
 }
 
 func (m *Controller) ConnectAlbumGridActions(grid *widgets.GridView) {
@@ -516,3 +520,49 @@ func (c *Controller) SetTrackRatings(trackIDs []string, rating int) {
 		c.App.PlaybackManager.OnTrackRatingChanged(id, rating)
 	}
 }
+
+func (c *Controller) ShowDownloadDialog(track *mediaprovider.Track) {
+	parts := strings.Split(track.FilePath, "/")
+	fileName := parts[len(parts)-1]
+
+	dg := dialog.NewFileSave(
+		func(file fyne.URIWriteCloser, err error) {
+			if err != nil {
+				log.Println(err)
+				return
+			}
+
+			if file == nil {
+				return
+			}
+
+			filePath := file.URI().Path()
+			go c.downloadTrack(track.ID, filePath)
+		},
+		c.MainWindow)
+	dg.SetFileName(fileName)
+	dg.Show()
+}
+
+func (c *Controller) downloadTrack(trackID, filePath string) {
+	reader, err := c.App.ServerManager.Server.DownloadTrack(trackID)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	saveDir, err := os.Create(filePath)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	defer saveDir.Close()
+
+	_, err = io.Copy(saveDir, reader)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	log.Printf("Saved song to: %s\n", saveDir.Name())
+}

ui/widgets/tracklist.go

@@ -70,12 +70,13 @@ type Tracklist struct {
 	DisableSorting bool
 
 	// user action callbacks
-	OnPlayTrackAt   func(int)
-	OnPlaySelection func(tracks []*mediaprovider.Track, shuffle bool)
-	OnAddToQueue    func(trackIDs []*mediaprovider.Track)
-	OnAddToPlaylist func(trackIDs []string)
-	OnSetFavorite   func(trackIDs []string, fav bool)
-	OnSetRating     func(trackIDs []string, rating int)
+	OnPlayTrackAt        func(int)
+	OnPlaySelection      func(tracks []*mediaprovider.Track, shuffle bool)
+	OnAddToQueue         func(trackIDs []*mediaprovider.Track)
+	OnAddToPlaylist      func(trackIDs []string)
+	OnSetFavorite        func(trackIDs []string, fav bool)
+	OnSetRating          func(trackIDs []string, rating int)
+	OnShowDownloadDialog func(track *mediaprovider.Track)
 
 	OnShowArtistPage func(artistID string)
 	OnShowAlbumPage  func(albumID string)
@@ -508,6 +509,10 @@ func (t *Tracklist) onShowContextMenu(e *fyne.PointEvent, trackIdx int) {
 					t.OnAddToPlaylist(t.SelectedTrackIDs())
 				}
 			}))
+		t.ctxMenu.Items = append(t.ctxMenu.Items,
+			fyne.NewMenuItem("Download", func() {
+				t.onDownload(t.selectedTracks())
+			}))
 		t.ctxMenu.Items = append(t.ctxMenu.Items, fyne.NewMenuItemSeparator())
 		t.ctxMenu.Items = append(t.ctxMenu.Items,
 			fyne.NewMenuItem("Set favorite", func() {
@@ -582,6 +587,12 @@ func (t *Tracklist) onAlbumTapped(albumID string) {
 	}
 }
 
+func (t *Tracklist) onDownload(tracks []*mediaprovider.Track) {
+	for _, track := range tracks {
+		t.OnShowDownloadDialog(track)
+	}
+}
+
 func (t *Tracklist) findTrackByID(id string) *mediaprovider.Track {
 	idx := sharedutil.Find(t.tracks, func(tr *trackModel) bool {
 		return tr.track.ID == id